Here, each customer has a unique identifier: "customer_id". Table 1 has columns where repeated values occur in rows. For example, customer_id will be the same in the first four lines, as these lines ...
A lightweight JavaScript plugin to generate CSV, XLS, PDF, DOC, or export a DOM element to HTML—all from the frontend!
Sometimes you face the problem to export the data into csv file using clientside platform. In this case you can use javascript and jquery.